ARMY TM AIR FORCE TO 36A12-1C-441

Transcription

1 ARMY TM AIR FORCE TO 36A12-1C-441 TECHNICAL MANUAL OPERATOR S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL) TRUCK, CARGO: 5-TON, 6X6 DROPSIDE, M923 ( ) (EIC: BRY); M923A1 ( ) (EIC: BSS); M923A2 ( ) (EIC: BS7); M925 ( ) (EIC: BRT); M925A1 ( ) (EIC: BST); M925A2 ( ) (EIC: BS8); TRUCK, CARGO: 5-TON, 6X6 XLWB, M927 ( ) (EIC: BRV); M927A1 ( ), (EIC: BSW); M927A2 ( ) (EIC: BS9); M928 ( ) (EIC: BRU); M928A1 ( ) (EIC: BSX); M928A2 ( ) (EIC: BTM); TRUCK, DUMP: 5-TON, 6X6, M929 ( ) (EIC: BTH); M929A1 ( ) (EIC: BSY); M929A2 ( ) (EIC: BTN); M930 ( ) (EIC: BTG); M930A1 ( ), (EIC: BSZ); M930A2 ( ) (EIC: BTO); TRUCK, TRACTOR: 5-TON, 6X6, M931 ( ) (EIC: BTE); M931A1 ( ) (EIC: BS2); M931A2 ( ) (EIC: BTP); M932 ( ) (EIC: BTD); M932A1 ( ) (EIC: BS5); M932A2 ( ) (EIC: BTQ); TRUCK, VAN, EXPANSIBLE: 5-TON, 6X6, M934 ( ) (EIC: BTB); M934A1 ( ) (EIC: BS4); M934A2 ( ) (EIC: BTR); TRUCK, MEDIUM WRECKER: 5-TON, 6X6, M936 ( ) (EIC: BTF); M936A1 ( ) (EIC: BS6); M936A2 ( ) (EIC: BTT). TABLE OF CONTENTS HOW TO USE THIS MANUAL INTRODUCTION 1-1 OPERATING INSTRUCTIONS 2-1 PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) MAINTENANCE INSTRUCTIONS 3-1 TROUBLESHOOTING PROCEDURES 3-2 ii iii 2-28 REFERENCES A-1 COMPONENTS OF END ITEM (COEI) AND BASIC ISSUE ITEMS (BII) LISTS B-1 ADDITIONAL AUTHORIZATION LIST (AAL) C-1 EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST D-1 STOWAGE AND SIGN GUIDE E-1 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. HEADQUARTERS, DEPARTMENTS OF THE ARMY AND THE AIR FORCE

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3 1. DO NOT operate your vehicle engine in enclosed area. 2. DO NOT idle vehicle engine with vehicle windows closed. 3. DO NOT drive vehicle with inspection plates or cover plates removed. 4. BE ALERT at all times for exhaust odors. 5. BE ALERT for exhaust poisoning symptoms. They are: Headache Dizziness Sleepiness Loss of muscular control WARNING EXHAUST GASES CAN KILL 6. IF YOU SEE another person with exhaust poisoning symptoms: Remove person from area Expose to open air Keep person warm Do not permit person to move Administer artificial respiration* or CPR, if necessary *For artificial respiration, refer to FM BE AWARE, the field protective mask for Nuclear-Biological-Chemical (NBC) protection will not protect you from carbon monoxide poisoning. THE BEST DEFENSE AGAINST EXHAUST POISONING IS ADEQUATE VENTILATION. WARNING HIGH INTENSITY NOISE Hearing protection is required for all personnel working in and around this vehicle while the engine is running (reference AR 40-5 and TB MED 501). Warning a

4 WARNING SUMMARY If Nuclear, Biological, or Chemical (NBC) exposure is suspected, all air filter media should be handled by personnel wearing protective equipment. Consult your unit NBC officer or NBC NCO for appropriate handling or disposal instructions. Extreme care should be taken when removing surge tank filler cap if temperature gauge reads above 175 F (79 C). Steam or hot coolant under pressure will cause injury. Pump brakes gradually when slowing or stopping vehicle on ice, snow, or wet pavement. Sudden stop will cause vehicle wheels to lock, engine to stall, and loss of power steering. Failure to do this will result in injury or death. Ground spike must be driven into ground inches (46-61 centimeters) and spike cable connected to the chassis before power can be taken from outside source. Failure to do this will result in electrical damage, injury, or death. Ensure spike cable ring terminal makes good contact with bare metal. If necessary, scrape contact area clean of dirt, paint, or rust. Failure to do this will result in electrical damage, injury, or death. Vehicle will become charged with electricity if A-frame contacts or breaks high voltage wire. Do not leave vehicle while high voltage line is in contact with A-frame or vehicle. Failure to do this will result in injury or death. Notify nearby personnel to have electrical power turned off. Do not put vehicle in motion until warning light is extinguished, and alarm (buzzer) stops sounding. If air pressure gauges indicate less than 90 psi (621 kpa), turn ignition and battery switches to OFF positions, and notify unit maintenance. Failure to do this will result in injury or death. Alcohol used in alcohol evaporator is flammable, poisonous, and explosive. Do not smoke when adding fluid and do not drink fluid. Failure to do this will result in injury or death. Stay clear of dump body and cab protector at all times during loading and unloading operations. Dump body can unexpectedly raise when a heavy load is dropped into dump body and will cause injury or death. Do not smoke, have open flames, or make sparks around the batteries, especially if the caps are off. They can explode and cause injury or death. Do not lower load without a ground guide. Direct all personnel to stand clear of lifting operations. Swinging loads will cause injury or death. Do not perform fuel system checks or inspection while smoking or near fire, flames, or sparks. Fuel could ignite, causing damage to vehicle, injury, or death. This vehicle has been designed to operate safely and efficiently within the limits specified in this TM. Operation beyond these limits is prohibited IAW AR 70-1 without written approval from the Commander, U.S. Army Tank-automotive and Armaments Command, ATTN: AMCPEO-CM-S, Warren, MI Block vehicle wheels if operating site is on a grade, no matter how slight. Failure to do this will result in injury or death. Warning b Change 2

5 WARNING SUMMARY (Cont d) Do not use hand throttle while driving. The hand throttle will not disengage when brakes are applied. Failure to do this will result in injury or death. Open van door slowly. Personnel may be on ladder. Use caution when using ladder. Use ground guide when backing up to parked semitrailer. Failure to do this will result in damage to vehicle, injury, or death. Do not pull tractor forward beyond approach ramps until all air lines are disconnected. Failure to do this will result in injury or death. Death or serious injury to soldiers, or damage to army equipment will occur if the instructions in this procedure are not followed. Liquid surge results from liquid s movement in partially-filled tanks, which may result in loosing control of 5,000 gallon fuel tankers causing vehicle damage, injury or death to personnel. On cross-country terrain, payload is limited to 3,000 gallons of fuel if the prime mover is an M931/A1/A2 or M932/A1/A2 series 5-ton tractor. Failure to comply may result in damage to vehicle or injury or death to personnel. Stopping distance is generally increased by ABS technology. ABS technology is designed to perform a conventional braking technique called stab braking automatically using wheel speed sensors. Drivers must understand they should not pump the brakes on an ABS-equipped vehicle, as this will deactivate the ABS. Drivers must also understand that by removing pressure from the brake pedal, drivers can also deactivate the ABS. Failure to comply may result in damage to vehicle or injury or death to personnel. When the ABS senses impending wheel lockup, the ECU will modulate the relays which will repeat a release and recharge cycle of air in the brake chambers. Unlike a car s ABS, where you can feel this modulation on the brake pedal, you will not feel any modulation of the brake pedal on an air brake system. When the ABS does modulate, you will feel a jerking sensation of the vehicle as the brakes rapidly release and lock. Failure to comply may result in damage to vehicle or injury or death to personnel. M939 series vehicles have a conventional air brake system, which is very sensitive. Drivers of these vehicles must be well-trained in operating tactical vehicles with air brakes. Air brakes are unique because braking force is proportional to pedal travel, but the driver does not experience resistance from the brake pedal. An inexperienced driver may respond to lack of resistance by applying too much force to brake pedal. Operators can be confident that M939 series trucks equipped w/abs brakes have more than adequate brake capacity for safe mountain terrain operations. Do not drive too fast for total weight of vehicle, amount of fuel in tanker, length and angle of grade, road conditions, and weather. Failure to do so may result in damage to vehicle or injury or death to personnel. Comply with warning signs indicating length and angle of grade. Failure to comply may result in damage to equipment or injury or death to personnel. Change 2 Warning c

6 WARNING SUMMARY (Cont d) Ensure vehicle is moving mph (16 24 km/h) slower than posted ramp speed for entrance or exit ramps. Failure to comply may result in vehicle rollover, causing damage to vehicle or injury or death to personnel. ABS technology is designed to maintain rolling traction and steering. The rolling action may produce longer stopping distances on some surfaces, such as freshly fallen snow or loose gravel. The ABS steering advantage outweighs any braking disadvantage on these surfaces. Evasive steering techniques are designed to allow the driver to steer the vehicle clear of damage. By maintaining a speed reduction without wheel lockup, ABS increases steerability of the vehicle. The driver should use just enough steering movement to adjust the vehicle to a clear space on the roadway. Avoid steering more than necessary to clear an obstacle. Oversteering may cause a skid, jackknife, or rollover. Failure to comply may cause damage to vehicle or injury or death to personnel. Do not drive faster than road or weather conditions permit. Maximum safe speed limit for normal highway driving is 55 mph (88 km/h). Stopping can be adversely affected by poor road/weather conditions. Drive at a slow, safe speed in poor conditions to avoid excessive braking. Failure to comply may result in damage to equipment or serious injury or death to personnel. Do not pump brakes that are locking on a vehicle equipped with ABS when stopping. ABS will automatically release wheels that are locking and apply pressure to the other wheels. Failure to do so may result in damage to vehicle or injury or death to personnel. Warning d Change 2

7 TECHNICAL MANUAL NO TECHNICAL ORDER NO. 36A12-1C-441 CHANGE NO. 2 ARMY TM AIR FORCE TO 36A12-1C-441 C2 HEADQUARTERS, DEPARTMENT OF THE ARMY AND AIR FORCE WASHINGTON, D.C., 30 SEPTEMBER 2004 OPERATOR S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1, and M939A2 SERIES TRUCKS (DIESEL) TRUCK, CARGO: 5-TON, 6X6 DROPSIDE, M923 ( ) (EIC: BRY); M923A1 ( ) (EIC: BSS; M923A2 ( ) (EIC: BS7); M925 ( ) (EIC: BRT); M925A1 ( ) (EIC: BST); M925A2 ( ) (EIC: BS8); TRUCK, CARGO: 5-TON, 6X6 XLWB, M927 ( ) (EIC: BRV); M927A1 ( ), (EIC: BSW); M927A2 ( ) (EIC: BS9); M928 ( ) (EIC: BRU) M928A1 ( ) (EIC: BSX); M928A2 ( ) (EIC: BTM); TRUCK, DUMP: 5-TON, 6X6, M929 ( ) (EIC: BTH); M929A1 ( ) (EIC: BSY); M929A2 ( ) (EIC: BTN); M930 ( ) (EIC: BTG); M930A1 ( ); (EIC: BSZ); M930A2 ( ) (EIC: BTO); TRUCK, TRACTOR: 5-TON, 6X6, M931 ( ) (EIC: BTE); M931A1 ( ) (EIC: BS2); M931A2 ( ) (EIC: BTP); M932 ( ) (EIC: BTD); M932A1 ( ); EIC: BS5); M932A2 ( ) (EIC: BTQ); TRUCK, VAN, EXPANSIBLE: 5-TON, 6X6, M934 ( ) (EIC: BTB); M934A1 ( ); (EIC: BS4); M934A2 ( ) (EIC: BTR); TRUCK, MEDIUM WRECKER: 5-TON, 6X6, M936 ( ) (EIC: BTF); M936A1 ( ) (EIC: BS6); M936A2 ( TM , August 1996, is changed as follows: 1. Remove old pages and insert new pages as indicated below. 2. New or changed material is indicated by a vertical bar in the margin of the page. Remove page Insert page Warning a and Warning b Warning a through Warning d None A and B i through iii/(iv blank) i through iii/(iv blank) 1-5 through through and and through through and and 1-50 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

8 Remove page Insert page 1-57 through through and and through through through through and and through through and and through through through through through through through through and and and and through through through through and and and and and and and and and and through through and and through through /(3-62 blank) 3-61/(3-62 blank) A-1 and A-2 A-1 and A-2 B-3 through B-6 B-3 through B-6 B-9 through B-24 B-9 through B-24 C-1 through C-5/(C-6 blank) C-1 through C-5/(C-6 blank) D-1 through D-4 D-1 through D-4 INDEX 1 through INDEX 18 INDEX 1 through INDEX 23 (INDEX 24 blank) DA Form DA Form File these change sheets in front of the publication for reference purposes.

9 By Order of the Secretary of the Army: Official: PETER J. SCHOOMAKER General, United States Army Chief of Staff JOEL B. HUDSON Administrative Assistant to the Secretary of the Army By Order of the Secretary of the Air Force: JOHN P. JUMPER General, United States Air Force Chief of Staff Official: GREGORY S. MARTIN General, United States Air Force Commander, Air Force Materiel Command Distribution: To be distributed in accordance with the initial distribution number (IDN) XXXXXXX, requirements for TM

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11 TECHNICAL MANUAL NO TECHNICAL ORDER NO. 36A12-1C-441 CHANGE NO. 2 ARMY TM AIR FORCE TO 36A12-1C-441 C1 HEADQUARTERS, DEPARTMENT OF THE ARMY AND THE AIR FORCE WASHINGTON, D.C., 22 Feb 1999 OPERATOR S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1 AND M939A2 SERIES (DIESEL) TRUCK, CARGO: 5-TON, 6X6, DROPSIDE M923 ( ), M923A1 ( ), M923A2 ( ), M925 ( ), M925A1 ( ), M925A2 ( ); TRUCK, CARGO: 5-TON, 6X6, M924 ( ), M924A1 ( ), M926 ( ), M926A1 ( ); TRUCK, CARGO: 5-TON, 6X6, XLWB, M927 ( ), M927A1 ( ), M927A2 ( ), M928 ( ), M928A1 ( ), M928A2 ( ); TRUCK, DUMP: 5-TON 6X6, M929 ( ), M929A1 ( ), M929A2 ( ), M930 ( ), M930A1 ( ), M929A2 ( ); TRUCK, TRACTOR: 5-TON 6X6, M931 ( ), M931A1 ( ), M931A2 ( ), M932 ( ), M932A1 ( ), M932A2 ( ); TRUCK, VAN, EXPANSIBLE: 5-TON 6X6, M934 ( ), M934A1 ( ), M934A2 ( ), M935 ( ), M935A1 ( ) M935A2 ( ); TRUCK, MEDIUM WRECKER: 5-TON, 6X6, M936 ( ), M936A1 ( ), M936A2 ( ). This change is issued in conjunction with Safety of Use Message (SUOM), TACOM Control No It emphasizes safe driving procedures to be followed by M939 vehicle operators. TM , August 1996, is changed as follows: Remove page Insert page 1-23 and and and and DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

12 By Order of the Secretary of the Army: DENNIS J. REIMER General, United States Army Chief of Staff Administrative Assistant to the Secretary of the Army By Order of the Secretary of the Air Force: RONALD R. FOGLEMAN General, United States Air Force Chief of Staff Official: HENRY VICCELLIO, JR. General, United States Air Force Commander, Air Force Materiel Command DISTRIBUTION: To be distributed in accordance with the initial distribution number (IDN) , requirements for TM

13 LIST OF EFFECTIVE PAGES NOTE: The portion of the text affected by the changes is indicated by a vertical line in the outer margins of the page. Dates of issue for original and changed pages are: Original August 1996 Change February 1999 Change September 2004 TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 490. CONSISTING OF THE FOLLOWING: Page No...*Change No. Page No...*Change No. Page No...*Change No. warning a warning b warning c Added....2 warning d Added....2 A - B Added i ii - iii iv blank Added Deleted *Zero in this column indicates original page Added blank A-1 - A B-1 - B B-4 - B B-7 - B B-9 - B B B-12 - B B B B-20 - B Change 2 A

14 LIST OF EFFECTIVE PAGES (Cont d) Page No...*Change No. Page No...*Change No. Page No...*Change No. B-22 - B B C C-2 - C C-6 blank D D-2 - D E-1 - E E-4 blank Index 1 - Index Index 24 blank DA Form *Zero in this column indicates original page. Change 2 B

15 TECHNICAL MANUAL NO ARMY TM AIR FORCE TO 36A12-1C-441 HEADQUARTERS, DEPARTMENT OF THE ARMY TECHNICAL ORDER AND THE AIR FORCE NO. 36A12-1C441 Washington DC, 15 August 1996 OPERATOR S MANUAL FOR TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL) i

16 This change supersedes a portion of LO , dated June REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this publication. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Submit your DA Form 2028 (Recommended Changes to Equipment Technical Publications), through the Internet, on the Army Electronic Product Support (AEPS) website. The Internet address is If you need a password, scroll down and click on ACCESS REQUEST FORM. The DA Form 2028 is located in the ONLINE FORMS PROCESSING section of the AEPS. Fill out the form and click on SUBMIT. Using this form on the AEPS will enable us to respond quicker to your comments and better manage the DA Form 2028 program. You may also mail, fax or your letter or DA Form 2028 direct to: AMSTA-LC-CI Tech Pubs, TACOM-RI, 1 Rock Island Arsenal, Rock Island, IL The address is TACOM-TECH-PUBS@ria.army.mil. The fax number is DSN or Commercial (309) DISTRIBUTION STATEMENT A Approved for public release; distribution is unlimited. HOW TO USE THIS MANUAL iii Page CHAPTER 1 INTRODUCTION Section I. General Information II. Equipment Description III. Principles of Operation CHAPTER 2 OPERATING INSTRUCTIONS Section I. Description and Use of Operator s Controls and Indicators. 2-1 II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) III. Operation Under Usual Conditions IV. Operation Under Unusual Condition V. Operation of Special Purpose Kits CHAPTER 3 MAINTENANCE INSTRUCTIONS I. Lubrication Instructions II. TROUBLESHOOTING PROCEDURES III. Maintenance Procedures APPENDIX A REFERENCES A-1 ii Change 2

17 APPENDIX B COMPONENTS OF END ITEM (COEI) B-1 AND BASIC ISSUE ITEMS (BII) LISTS APPENDIX C ADDITIONAL AUTHORIZATION LIST (AAL) C-1 APPENDIX D EXPENDABLE/DURABLE SUPPLIES D-1 AND MATERIALS LIST APPENDIX E STOWAGE AND SIGN GUIDE E-1 HOW TO USE THIS MANUAL 1. The information contained in this manual can be accessed in several ways. a. If you know what area you are looking for, use the front cover index. Find the appropriate box and match it to the blackened pages on the side of the book, or use the page number listed in the box. b. If you are looking for a specific paragraph, refer to the index at the back of the manual. 2. This manual consists of: a. Chapter 1, Introduction provides information for completing forms and records, gives a familiarization of equipment, and a functional and physical description of major equipment. b. Chapter 2, Operating Instructions provides information needed to use or operate the vehicle. c. Chapter 3, Maintenance Instructions provides information covering lubrication, troubleshooting, and corrective maintenance. 3. Types of notations a. Warnings are posted immediately prior to text covering any area that would present a situation that may result in injury or death. Compliance is mandatory. b. Cautions will be found on the same page and preceding the text covering any area that would present a situation that may result in damage to equipment. c. Notes will precede text covering an area with the intent to alter normal procedures for unique situations or equipment, or point out areas of special concern. 4. Appendices have been provided to: a. Basic Issue Items (BII) list specify the minimum essential items to place and maintain the M939, M939A1, and M939A2 (M939/A1/A2) series vehicles in operation, and are maintained with the vehicle. b. Additional Authorization List (AAL) specify items not shipped with vehicles, but are authorized for support of the M939/A1/A2 series vehicles. c. Expendable/Durable Supplies and Materials List specify expendable/durable supplies and materials you will need to operate and maintain M939/A1/A2 series vehicles. Change 2 iii (iv blank)

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19 CHAPTER 1 INTRODUCTION Section I. General Information (page 1-1) Section II. Equipment Description and Data (page 1-8) Section III. Principles of Operation (page 1-27) Section I. GENERAL INFORMATION M923A2 AND M925A2 M927A2 AND M928A2 1-1

20 M929A2 AND M930A2 M931A2 AND M932A2 1-2

21 M934A2 M936A2 1-3

22 1-1. SCOPE a. This operator s manual contains instructions for operating and servicing the following M939/A1/A2 series vehicles: (1) M923/A1/A2, Cargo Truck, WO/W (Dropside) (2) M925/A1/A2, Cargo Truck, W/W (Dropside) (3) M927/A1/A2, Cargo Truck, WO/W (XLWB) (4) M928/A1/A2, Cargo Truck, W/W (XLWB) (5) M929/A1/A2, Dump Truck, WO/W (6) M930/A1/A2, Dump Truck, W/W (7) M931/A1/A2, Tractor Truck, WO/W (8) M932/A1/A2, Tractor Truck, W/W (9) M934/A1/A2, Expansible Van, WO/W (10) M936/A1/A2, Medium Wrecker, W/W b. Vehicles purpose. (1) The M923/A1/A2, M925/A1/A2, M927/A1/A2, and M928/A1/A2 series cargo trucks provide transportation of personnel or equipment over a variety of terrain and climate conditions. (2) The M929/A1/A2 and M930/A1/A2 series dump trucks are used to transport various materials over a variety of terrains. Each vehicle can be equipped with troop seat, and tarpaulin and bow kits for troop transport operations. (3) The M931/A1/A2 and M932/A1/A2 series tractor trucks are equipped with a fifth wheel used to haul a semitrailer over a variety of terrain. (4) The M934/A1/A2 series expansible vans are designed to transport electronic base stations over a variety of terrain. (5) The M936/A1/A2 series wreckers are designed for recovery of disabled or mired vehicles, and perform crane operation. c. The material presented here provides operators with information and procedures needed to provide the safest and most efficient operation and servicing of these vehicles. This information includes: (1) Vehicle limitations. (2) The function of controls. (3) Operation instructions for vehicle. (4) Cautions and warnings to operators regarding safety to personnel and equipment. (5) Operator maintenance checks and services. (6) Troubleshooting procedures to be followed by operator if the vehicle malfunctions. (7) Operator forms and records. 1-4

23 1-2. MAINTENANCE FORMS a. Vehicle Maintenance Forms and Records. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA Pam as contained in the maintenance management update. b. Hand Receipt Manual This manual has a companion document with a TM number followed by -HR (which stands for Hand Receipt). The TM HR consists of preprinted hand receipts (DA Form 2062) that list end item related equipment (i.e., COEI, BII, and AAL) you must account for. As an aid to property accountability, additional -HR manuals may be requisitioned from the following source in accordance with procedures in chapter 3, AR 310-2: The U.S. Army Adjutant General Publications Center 2800 Eastern Blvd. Baltimore, MD CORROSION PREVENTION AND CONTROL (CPC) Corrosion Preventive and Control (CPC) of Army materiel is a continuing concern. It is important that any corrosion problems with this item be reported so that the problems can be corrected and improvements can be made to prevent problems in the future items. While corrosion is typically associated with rusting of metals, it can also include deterioration of other materials, such as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these materials may be a corrosion problem. If a corrosion problem is identified, it can be reported using Standard Form 368, Product Quality Deficiency Report. Use of key words such as corrosion, rust, deterioration, or cracking will ensure that the information is identified as a CPC problem. The form should be submitted to the address specified in DA Pam DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE Procedures for destruction of Army materiel to prevent enemy use can be found in TM REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR S) If your vehicle needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don t like about your equipment. Let us know why you don t like the design or performance. The preferred method for submitting QDRs is through the Army Electronic Product Support (AEPS) website under the Electronic Deficiency Reporting System (EDRS). The web address is: This is a secured site requiring a password which can be applied for on the front page of the website. If the above method is not available to you, put it on an SF 368, Product Quality Deficiency Report (PQDR), and mail it to us at: U.S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-TR-E/PQDR MS 267, 6501 E. 11 Mile Road, Warren, MI We ll send you a reply. Change 2 1-5

24 1-6. WARRANTY INFORMATION Deleted 1-7. NOMENCLATURE CROSS-REFERENCE LIST The following is an alphabetical list of commonly used military terms that appear in this manual. This list is cross-referenced to commonly understood terms used in everyday speech that mean the same thing. Engine Coolant antifreeze/water Exhaust Stack tailpipe Failsafe Unit warning buzzer Fording crossing through water Grade steepness of hill Hydraulics operated by oil pressure Inclement Weather bad weather (rain, snow, high winds) Indicators gauges, warning lights, etc. Mired stuck in mud or snow Operation task Operator driver Slaving jump starting Splash Shields mud flaps Transport to carry Turning Radius distance needed to make a U-turn Usual Conditions good roads, good weather 1-8. LIST OF ABBREVIATIONS All abbreviations that appear in this manual are listed below. AAL Additional Authorization List ABS Antilock Brake System AC Alternating Current BII Basic Issue Items B.O blackout BRT bright CC cross-country C degree Celsius cm centimeter Contd continued CPC Corrosion Prevention Control CTIS Central Tire Inflation System cu ft cubic feet CW chain (and) wire rope (lubricating oil) DA Department of Army DC Direct Current DFA diesel fuel (arctic) 1-6 Change 2

25 1-8. LIST OF ABBREVIATIONS (Contd) drv drive ECU Electronic Control Unit EIR Equipment Improvement Recommendation emer emergency F degree Fahrenheit ft feet/foot g gram GAA grease, automotive, and artillery gal gallon GO gear oil GOS gear oil (sub-zero) Hwy highway in inch kg kilogram km kilometer km/h kilometers per hour kpa kilopascal l liter lb pound lb-ft pound-feet lg long LO Lubrication Order m meter MAC Maintenance Allocation Chart mi mile mpg miles per gallon mph miles per hour N m Newton meter NBC Nuclear, Biological, or Chemical NSN National Stock Number OE/HDO oil, engine/heavy duty oil OEA oil, engine (arctic) oz ounce para paragraph pg page PMCS Preventive Maintenance Checks and Services pr pair psi pounds per square inch pt pint PTO power takeoff qt quart rpm revolutions (turns) per minute TM technical manual w/hlg with hydraulic liftgate w/o without wo/w without winch w with w/w with winch xlwb extra long wheelbase yd yard Change 2 1-7

26 1-9. GLOSSARY The following list shows definitions of military terms that appear in this manual. Other terms in this manual are defined in the paragraph where they first appear. Angle of Approach Angle between front tires and front bumper Angle of Departure Angle between rear tires and rear bumper Fording Crossing through water Grade Steepness of terrain Hydraulic Operated by oil pressure Operator Driver of vehicle Tarpaulin Canvas cover Slaving Jump starting 6X6 Each vehicle has six axle ends and all six are capable of driving Torque Measurable force or power required to do work Torqued Requirement for a specified force to be applied to ensure proper seating or seal Section II. EQUIPMENT DESCRIPTION AND DATA EQUIPMENT DESCRIPTION INDEX PARA. NO. TITLE PAGE NO Equipment Characteristics, Capabilities, and Features Location and Description of Major Components Differences Between Models Equipment Data

27 1-11. EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES a. The 5-ton, 6x6, M939, M939A1, and M939A2 series vehicles are designed for use on all types of roads, highways, and cross-country terrain. These vehicles also operate in extreme temperatures such as arctic weather conditions. b. The M939 series vehicles are an improved version of the M809 series. The improvements make M939 series vehicles more reliable and easier to operate. The major improvements are: WARNING This vehicle has been designed to operate safely and efficiently within the limits specified in this TM. Operation beyond these limits is prohibited IAW AR 70-1 without written approval from the Commander, U.S. Army Tank-automotive and Armaments Command, ATTN: AMCPEO-CM-S, Warren, MI (1) Automatic Transmission (2) Improved Power Steering System (3) Complete Airbrake System (4) Improved Cooling System (5) Improved Electrical System (6) Three-Crew Member Cab (7) Tilt Hood (8) Hydraulically Powered Front Winch c. The M939 series vehicles use 11:00 x R20 tires and have rear tandem duals, while the M939A1 and M939A2 series vehicles use 14:00 x R20 super sized tires and rear tandem singles. The mounted tires and spare on each vehicle are nondirectional in design and use. d. The M939 and M939A1 series vehicles employ the Cummings (NHC 250) 250 horsepowered engine, while the M939A2 series vehicles use a smaller, turbocharged Cummings (6CTA8.3) 240 horsepowered engine. The M939A2 series vehicles additionally have the Central Tires Inflation System (CTIS) which allows for greater tactical mobility. e. All M939/A1/A2 series vehicles utilize the same automatic transmission, are equipped with a spare tire mount at the rear of the cab, have removable canvas cab tops, and are supplied with pintle hooks and air connections used for towing. f. The 5-ton load limit rating of M939/A1/A2 series vehicles does not mean these vehicles are limited to 5-ton payloads. A vehicle rating only indicates the maximum amount of cargo weight the vehicle axles and frame can withstand when operating under the worst cross-country conditions. 1-9

28 1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS a. This paragraph contains information regarding the major components that makeup the specific models of the M939, M939A1, and M939A2 series vehicles. These are: (1) Chassis (2) Cab (3) Body (4) Engine (5) Fuel Tank b. Chassis Types: (1) M927/A1/A2, M928/A1/A2, and M934/A1/A2 model vehicles utilize the 215 in. (546.1 cm) Extra Long Wheelbase (XLWB) chassis. This facilitates transporting of large and awkward loads. (2) M923/A1/A2, M925/A1/A2, and M936/A1/A2 model vehicles utilize the 179 in. (454.7 cm) wheelbase. (3) M929/A1/A2, M930/A1/A2, M931/A1/A2, and M932/A1/A2 model vehicles utilize the 167 in. (424.2 cm) wheelbase. c. Cab Assembly: all models use the same cap assembly even though minor changes are made to accommodate options for specific models. d. Body Assembly: (1) M923/A1/A2 and M925/A1/A2 model vehicles use the same cargo body. (2) M927/A1/A2 and M928/A1/A2 model vehicles uses the same extended cargo body. (3) M929/A1/A2 and M930/A1/A2 model vehicles use the dump body. (4) M931/A1/A2 and M932/A1/A2 model vehicles use the fifth wheel approach plate and check plate. (5) M934 and M939/A1/A2 model vehicles use the van body. (6) M936 and M939/A1/A2 model vehicles use the crane and body assembly. e. Engine Type: All M939/A1 series vehicles employ the Cummins NHC 250 engine, while M939A2 series vehicles use the Cummings 6CTA8.3 engine. f. Fuel Tank Types: (1) Initial issue tanks used on M939/A1 series vehicles are top fill, but replacement tanks may be substituted with M939A2 series vehicle side fill fuel. (2) Fuel tank quantities and capacities differ between models. Refer to table 1-6 for specific information on your model. 1-10

29 1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd) A B C D E F G H 215 IN. (546.1 CM) EXTRA LONG WHEELBASE (XLWB) CHASSIS FRONT WINCH Used on M925/A1/A2, M928/A1/A2, M930/A1/A2, M932/A1/A2, and M936/A1/A2 model vehicles to recover mired vehicles and in conjunction with A-frame kit for lifting operations. TILT HOOD Tilts forward and can be locked open to gain access to engine components. HOOD LATCHES Hold hood down when closed. CANVAS CAB ROOF Can be folded down to reduce overall height and facilitate use of machine gun mount kit. WINCH FRAME EXTENSION Used on winch models to extend frame for mounting of winch. EXPANSIBLE VAN BODY Is designed with hardware and electrical attachments to facilitate electronic equipment operation or maintenance. SPARE TIRE DAVIT Used on M934A1/A2 series vehicles for lifting and lowering spare tire. M934 models use a lifting eye located above spare tire. EXTENDED LONG CARGO BODY Is a fixed side bed designed to carry large awkward loads which will not fit in standard beds. 1-11

30 1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd) 179 IN. (454.7 CM) WHEELBASE CHASSIS A B C D E F REAR VIEW MIRROR Provides wide angle rear view of both right and left side, and rear sides of vehicle. REAR BOGIE Consists of two axles on M939/A1/A2 series vehicles. M939 series vehicles utilize 11:00R20 tires (four per axle), and M939A1/A2 series vehicles utilize 14:00R20 tires (two per axle). FOLDDOWN WINDSHIELD Allows for reduction in overall height of vehicle. HOOD TILTING HANDLE AND LATCH Used to pull on top front of hood to tilt and latch it in a secure position. CRANE AND BODY ASSEMBLY Used on M936/A1/A2 model vehicles. Used for recovering disabled and mired vehicles, and lifting operations. DROPSIDE CARGO BODY Provides unobstructed access to side for loading with fork lift (M923/A1/A2 and M925/A1/A2 model vehicles). 1-12

31 1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd) 167 IN. (424.2 CM) WHEELBASE CHASSIS G H I J K L M FIFTH WHEEL APPROACH PLATE AND DECK PLATE Used on M931/A1/A2 and M932/A1/A2 model vehicles. Provides mechanical connection between semitractor and semitrailer. SPARE TIRE AND MOUNTING BRACKET Provides storage location for spare tire. SPARE TIRE DAVIT Used for lifting and lowering tire. Use on M923/A1/A2, M925/A1/A2, M927/A1/A2, M928/A1/A2, M931/A1/A2, and M932/A1/A2 model vehicles. FUEL TANK Second tank for vehicles equipped with dual tank capacity. DUMP BODY Used on M929/A1/A2 and M930/A1/A2 model vehicles for carrying various loads over different terrains. SPARE TIRE LIFTING EYE Used for lifting and lowering spare tire on M929/A1/A2 and M930/A1/A2 model vehicles. FUEL TANK Used on all vehicles for storage of fuel. 1-13

32 1-13. DIFFERENCE BETWEEN MODELS Vehicle Table 1-1. Differences Between Models. Equipment/Function Description (para/page) M923A2,M925A2,M927A2, Central Tire Inflation System (para 1-20/page 1-57) M928A2,M929A2,M930A2, M931A2,M932A2,M934A2, M936A2 Body Type M923,M923A1,M923A2, Cargo Dropside (para 2-23/page 2-124) M925,M925A1,M925A2 M927,M927A1,M927A2, Cargo Fixed side (XLWB) (para 2-23/page 2-124) M928,M928A1,M928A2 M936,M936A1,M936A2 Crane (para 2-24/page 2-127) M929,M929A1,M929A2, Dump (para 2-25/page 2-146) M930,M930A1,M930A2 M931,M931A1,M931A2, Tractor (para 2-26/page 2-152) M932,M932A1,M932A2 M934,M934A1,M934A2 Van (para 2-27/page 2-158) M936,M936A1,M936A2 Floodlights (para 2-24/page 2-127) Fuel Tanks M929,M929A1,M929A2, Dual Tanks (116 gal) (439.1 L) (para 1-12/page 1-10) M930,M930A1,M930A2, M931,M931A1,M931A2, M932,M932A1,M932A2 M936,M936A1,M936A2 Dual Tanks (139 gal) (526.1 L) (para 1-12/page 1-10) M923,M923A1,M923A2, Single Tank (81 gal) (306.6 L) (para 1-12/page 1-10) M925,M925A1,M925A2, M927,M927A1,M927A2, M928,M928A1,M928A2, M934,M934A1,M934A2 M934,M934A1,M934A2 Heat/Air Conditioned Body (para 2-27f/page 2-164) (para 2-27g/page 2-166) 1-14

33 1-13. DIFFERENCE BETWEEN MODELS (Contd) Vehicle Table 1-1. Differences Between Models (Contd). Equipment/Function Operations Description (para/page) M934,M934A1,M934A2 Communications/Electronic (para 2-27/page 2-158) Repair M929,M929A1,M929A2, Dump (para 2-25/page 2-146) M930,M930A1,M930A2 M931,M931A1,M931A2, Fifth Wheel (para 2-26/page 2-152) M932,M932A1,M932A2 M923,M923A1,M923A2, Personnel/Cargo (para 2-23/page 2-124) M925,M925A1,M925A2, M927,M927A1,M927A2, M928,M928A1,M928A2, M929,M929A1,M929A2, M930,M930A1,M930A2 M936,M936A1,M936A2 Wrecker (para 2-41/page 2-127) Wheelbases M929,M929A1,M929A2, 167 in. (424.2 cm) (para 1-12/page 1-13) M930,M930A1,M930A2, M931,M931A1,M931A2, M932,M932A1,M932A2 M923,M923A1,M923A2, 179 in. (454.7 cm) (para 1-12/page 1-12) M925,M925A1,M925A2, M936,M936A1,M936A2 M927,M927A1,M927A2, 215 in. (546.1 cm) (para 1-12/page 1-11) M928,M928A1,M928A2, M934,M934A1,M934A2 Winch M925,M925A1,M925A2, Front (para 2-22/page 2-116) M928,M928A1,M928A2, M930,M930A1,M930A2, M932,M932A1,M932A2, M936,M936A1,M936A2 M936,M936A1,M936A2 Rear (para 2-24c/page 2-127) 1-15

34 1-14. EQUIPMENT DATA a. General. This paragraph organizes vehicle specifications, special equipment, and model differences in table form for easy reference by operators. b. Specifications. (1) Winch and Crane Data. See table 1-2. (2) Vehicle Dimensions. See table 1-3. (3) Weights. See table 1-4. (4) Chassis Dimensions. See table 1-5. (5) Capacities for Normal Operating Conditions. See table 1-6. (6) General Service Data. See table 1-7. (7) Engine and Cooling System Data. See table 1-8. (8) Automatic Transmission Data. See table 1-9. (9) Tire Inflation Data. See table (10) Shipping Dimensions. See table Table 1-2. Winch and Crane Data. Capacities Vehicle Description Standard Metric Ref. Para M925, M925A1, Front Winch: (2-22) M925A2, M928, Max. Load 20,000 lb 9,080 kg M928A1, M928A2, Cable Length 200 ft 61 m M930, M930A1, M930A2, M932, M932A1, M932A2 M936, M936A1, Front Winch: (2-24b) M936A2 Max. Load 20,000 lb 9,080 kg Cable Length 280 ft 85.4 m M936, M936A1, Rear Winch: (2-24c) M936A2 Max. Load 45,000 lb 20,430 kg Cable Length 350 ft m M936, M936A1, Crane: (2-24d) M936A2 Max. Load 20,000 lb 9,080 kg (w/boom jacks) Rotation 360 Retracted Length: 10 ft 3.05 m Extended Length: 18 ft 5.5 m Cable Length: 95 ft 5 in m 1-16 Change 2

35 Table 1-3. Vehicle Dimensions. Reducible Vehicle Length Height Width Height in. cm in. cm in. cm in. cm M M923A M923A M M925A M925A M M927A M927A M M928A M928A M M929A M929A M M930A M930A M M931A M931A M M932A M932A M M934A M934A M M936A M936A Ground Clearance Model Under Axle Under Chassis in. cm in. cm M M939A M939A

36 Table 1-4. Weights. Vehicle Empty Payload Towed Load (Pintle) lbs kg lbs kg lbs kg M923 21,600 9,806 10,000 4,540 15,000 6,810 M923A1 22,175 10,067 10,000 4,540 15,000 6,810 M923A2 20,930 9,502 10,000 4,540 15,000 6,810 M925 22,360 10,151 10,000 4,540 15,000 6,810 M925A1 23,275 10,567 10,000 4,540 15,000 6,810 M925A2 22,030 10,002 10,000 4,540 15,000 6,810 M927 27,749 12,598 10,000 4,540 15,000 6,810 M927A1 25,035 11,366 10,000 4,540 15,000 6,810 M927A2 23,790 10,801 10,000 4,540 15,000 6,810 M928 27,811 12,626 10,000 4,540 15,000 6,810 M928A1 26,135 11,865 10,000 4,540 15,000 6,810 M928A2 24,890 11,300 10,000 4,540 15,000 6,810 M929 25,888 11,753 10,000 4,540 15,000 6,810 M929A1 25,065 11,380 10,000 4,540 15,000 6,810 M929A2 23,820 10,814 10,000 4,540 15,000 6,810 M930 26,624 12,087 10,000 4,540 15,000 6,810 M930A1 26,165 11,879 10,000 4,540 15,000 6,810 M930A2 24,920 11,314 10,000 4,540 15,000 6,810 M931* 22,089 10,028 15,000 6,810 15,000 6,810 M931A1* 21,140 9,598 15,000 6,810 15,000 6,810 M931A2* 19,895 9,032 15,000 6,810 15,000 6,810 M932* 22,841 10,370 15,000 6,810 15,000 6,810 M932A1* 22,242 10,098 15,000 6,810 15,000 6,810 M932A2* 20,995 9,532 15,000 6,810 15,000 6,810 M934 29,946 13,595 5,000 2,270 15,000 6,810 M934A1 29,280 13,293 5,000 2,270 15,000 6,810 M934A2 28,035 12,728 5,000 2,270 15,000 6,810 M936** 39,334 17,858 7,000 3,178 20,000 9,080 M936A1** 38,155 17,322 7,000 3,178 20,000 9,080 M936A2** 36,910 16,757 7,000 3,178 20,000 9,080 * Loaded trailer weight on fifth wheel is 15,000 lb (6,810 kg); total semitrailer weight with payload is 37,500 lb (17,025 kg). ** On crane w/boom shipper raised and secured. 1-18